Apparatus for wrapping carbon dollies



4 Sheets-Sheet 1 A. KUNZE APPARATUS FOR WRAPPING CARBON DOLLIES Filed April 19, 1957 ww w Fifa/4,15

March 4, 1941.

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i APPARATUS FOR WRAPPING CARBCPN DOLLIES Filed April 19, 1535.37 4 Sheets-Sheet 2 March 4, 1941. A. KUNZE APPARATUS FOR wRAPPING CARBON DoLLIEs Filed April 19,y 1937 4 Sheets-Sheet 3 illllllll.. y

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APPARATUS FOR wRAPPING CARBON DOLLIEs Filed April l9 1937 4 Sheets-Sheet 4 Ali Patented Mar. 4, 1941 UNITED STATES APPARATUS FOR WRAPPING CARBON DOLLIES Armin Kunze, Berlin-Zehlendorf, Germany Application April 19, 1937, Serial No. 137,839 In Germany April. 30, 1936 v11?, Claims.

The invention has reference generally-to improvements in means for manufacturing carbon dollies and more particularly relates to an apparatus for wrapping carbon dollies.

It is the primary aim and object of this invention to provide an apparatus of the above character embodying improved means for effecting an entire automaticV Winding and wrapping of treated thread directly about -a'carbon 'dolly without necessitating the employment of a bag of textile material to hold the carbon in place.

More particularly the present invention includes the provision of a wrapping apparatus for carbon dollies in which the thread guide during its reciprocatory movement is moved beyond the front faces of the carbon dolly so as to effect an oblique wrapping or w-inding of the dolly while at the same time means are provided for effecting two different relative speeds between the carbon dolly and the thread guide, namely, a reciprocatory movement of the thread guide for producing the oblique windingand the slow axial movement of the thread guide for producing the circularfwinding.

Briefly the invention may be said to reside -in the provision of a device for mechanical carbon dollies for galvanic cells including a rotary spindle having a clamping chuck on the lower end thereof for clamping the carbon rod of the dolly with which co-operates an axially slidably mountedthr-ead guide capable of being reciprocated beyond the end surface of the dolly with an operative driving connection between the spindle and the thread guide.

Other objects as well as the nature, characteristic features and scope of the'invention will be more readily apparent from the following de- ,scription taken in connection with the accompanying specification and pointed out in the claims forming a part thereof.

The invention is hereinafter more particularly described with reference to the accompanying drawings which illustrates various devices forcarrying out the same.

Figure 1 shows a vertical section through an automatically operating device for wrapping the carbon dollies,

Figure 2 the different operative position of the device according to `Figure 1 in plan view,

Figures 3 and 4 part sections through a chucking arrangement of the device shown in Figure 1,

Figure 5 a part 'section through the feed table of the' device shown in Figure 1,

Figure 6 a plan view ofthe parts shown in Fig. 5J

Figures '7 and 8 an arrangement for applying insulating material for a device according to Figure 1, in front and side elevation.

Figure 9 a similar applying arrangement of a modified form.

Figure 10 a spindle and the vparts coacting ltherewith according to Figure 1 to-a larger scale,

Figures 11 to 13 different spindle positions,

Figure 14 a part section through a clamping and cutting-off arrangement,

Figure 15 a plan view of the arrangement accordingito Figure 14,

Figures `16 and 17 the arrangementlaccording to Fig. 15 in other positions, and

Figure 18 another device for carrying out the new method.

The wrapping around of the carbon dolly with a thread is carried out according to the invention in such `a manner that the thread runs obliquely with respect to the longitudinal axis. Preferably, however, a combined Awinding is produced in such a manner that the carbon dollies are wrapped round with a thread longitudinally and transversely or obliquely and transversely with respect tothe longitudinal axis. The manner of this wrapping will be clearly seen from Figures 10 and 18, in which are also shown two different devices for carrying out the same. cording to Figure 10 a carbon dolly l is clamped with its carbon rod 2 in a chuck 3 which is Xed at the end of a rotary spindle 4. With the spindle coacts a thread guide 5 which is preferably journalled parallel to it and is adapted to be moved to and fro with its arm S along the dolly I, during which it will occupy the two eX- treme positions shown, of which the lower one isv indicated with broken lines 6.

As will be seen, the thread l coming from a bobbin runs through an eye '8 at the end of the arm 6 Ato the carbon dolly. The oblique -position v Ypurpose the r'thread guide 9 may for instance be..

journalled with a ball and socket joint :in afXed guide Il and be driven by a.discl l3"which..is rotatable about its axis. I2.

The transverse vWrapping oiztthe dolly is. ef-

fected `simply by the :dollynbeing :moved slowly,.-

indicated at I3.

hollow space which serves for the reception of the carbon 2. The carbon is clamped through the downward motio-n of the spindle 4, the carbon rod forcing the pin I9, 2Q upwards and thereby compressing the collet. For opening the collet the sleeve I1 is forced during the upward motion against an abutment, so that it is pushed downwards with respect to the collet. At the same time the cone I9 forces the clamping jaws so far apart that the dolly drops.

It will be readily understood that the, new method may be carried out with a device consisting substantially only of a spindle, clamping chuck and thread guide. In order, however, to be rable to manufacture the carbon dollies in great quantities, according to the invention an automatically operating device according to Fig.l 1 is provided, in which a considerable number of' rotary spindles with thread guides are arranged in a circle in a rotary vdrum-shaped casing which, in the constructional form shown, consists of a cover 2|, a drum 22 and a bottom 23. With this drum coacts a feed-table 24, into which the dollies can be inserted equidistant from one another by hand by the attendant. The drum and the feedtable are driven by vertical shafts 25 and 26 at a xed speed ratio to one another.v The manner ingwhich the feed-table 24 and the spindles of the drum 22 coact is shown in Fig. 2 diagrammatically. The carbon dollies or their places of support inthe feed-table are indicated by I and thespindles of the drum 22 by 4.

In order to ensure the carbon rods of the dollies being properly engaged and clamped while the y spindles continue to rotate, according to the invention a special arrangement is provided, by

which the carbon dollies are guided at the clampspindles. For this purpose, as shown in Figures 1 and 5, the holders 21 for the carbon dollies are arranged in the feed table so as to be radially slidable and resilient and a cam is provided, indicated by 28 in Fig. 2, which compels the holders Ato travel from the point a to the point b along a circular path 29, namely the circular path of the spindles 4. In spite of the relatively rapid rotation of the drum 22 there is sufficient time during the movement from a to b for safely clamping the carbon rods of the dollies.

The details of the holders 21 and of the cam 28 will be gathered from Fig. 5. The carbon dollies are held resiliently in a hard rubber bush 30 which is itself disposed in a soft rubber sleeve 3|. For different lengths of dollies an adjusting pin 32 is provided. The holder bears with a roller 33 against the cam 28, on which is suitably provided a centering disc 34 of a centering device to be described below. As shown in Fig. 5, the holder is mounted on two bars 35, 36 which are radially slidable in the feed-table 24 and are forced outwards by a spring 31. As in spite of thecam 28 it is practically impossible so to guide the spindles and the carbon dollies that the axes of the spindles and carbon dollies will exactlycoincide, a

. Figure 11.

special centering device according to Figures 5 and 6 is provided, which consists of a number of slidable members 38 having a forked end 39 and of the already mentioned stationary centering disc 34. It Will be seen, that in each case a slidable member 38 engages the'corresponding carbon rod 2 and presses it against the rim of the disc 34. This motion is brought about by the radial movement of the holder 21, each slidable member 38 being, as shown in Figure 5, connected with the bar 35 by a pull member 4I which passes over a -roller 40. A spring 42 draws the slidable member back into its initial position. f

Before the actual wrapping of the dolly commences after it has been clamped in the clamping chuck, according to the invention the bottom 43 of the dolly is covered with an insulating material. This may be effected as shown in Figures 7 and v8 by means of a roller 44 which rotates in a direction B opposite to the direction of travel A of the dolly and dips into a vessel 46 filled with an insulating material 45. The carbon is controlled, as shown, by means of a circular cam 41 and a roller 48 at the top of the spindle 4 in such a manner that the bottom of the dolly brushes past the roller 44.

The wetting of the bottom of the dolly with insulating material, such as paraffin for instance, may also be effected, as shown in Figure 9, by immersing the dolly, the spindle 4 being controlled by means of a cam 49 in such a manner that the dolly moves in the direction of the arrows. The spindle is pressed against the cam by a spring 50.

The aforesaid wetting of the bottom of the dolly with a preferably sticky insulating material has lthe object of providing the thread, as it is beingwound around the relatively smooth dolly,

,with a hold at the bottom edge of the dolly.

The Wrapping of the dolly is effected, as shown in Figures 10 to 13, first of all by the thread-end being held rmly below the dolly and the threadguide being moved to and fro while the spindle is rotating, so that the oblique Winding shown is formed in the manner of the kno-wn cross-Wound cheeses.

For winding centering ridges the thread-guide is thereupon brought into the position 6, and the dolly with the spindle into the position shown in On the spindle continuing to rotate a centering ridge 5I consisting of superposed threads will then form itself. DuringV this part of the operation the thread 1 is preferably immersed in a vessel fitted with insulating material 52, for instance paraiiin. This is effected with a suitably vertically disposed, longitudinally displaceable dipping needle 53, through the eye 54 of which the thread runs.

Whilst the ridge 5I is being wound, the dolly is led pasta template 55 which with a suitable opening gives the ridge the desired shape. AImmediately following the Winding of the upper centering ridge 5I the spindle with the dolly is moved slowly upwards, so that the transverse winding indicated by 56 is formed, which has the special purpose of preventing the diameter of the dolly from changing subsequently. According to Figure 13 thedolly is held in the raised position there shown and at the same time the thread 1 is dipped. into the bath 52, so that-a paraffin-soaked ridge 51 is formed. For this purpose a template 55 `is again'. used and the rlayer-'being smoothed with aplate 58.

This Vfinishes' the dolly and,"through the spin- -dlef`4 rising and through the clamping sleeve |1 A'striking against an abutment 59 the 'clamping Lchuclr is opened, allowing the dolly to fall out.

In 4'Figure '2 these dierent operations are indi- "cat'ed by defining arrows in the sequence in which they take place. At c the carbon is seized and clamped and the spindle is thereupon moved upwards. The defining arrow d indicates the `operation'ofwetting the dolly bottom with insu- 'lating-materiaL Whilst the Kspindle in question ismoving correspondingly'to the'dening arrow e the dolly is obliquely/wound and,immediately following, the Winding 1- of theupper centering ridge takes'place, as shown `Vby f. The defining v`arrow'g indicates thewinding transversely of or around the vlperiphery-of the dolly. Thereupon vthe lower lcentering ridge is wound, this being yindicated by the defining arrowfh. Immediately after this the bottom of the dolly is again `provided with` insulating material (defining arrow i) Vand 4nally at the point 1c the dolly is ejected from the clamping chuck.

For gripping the thread end and at the same time cutting it loff a special device as shown in `Figures 14 and 15 is provided. 'I'his device is fixedv to Va longitudinally slidable and turnable guide-bar 60 (see also Fig. 1) ,each spindle having such a gripping and severing device associated with it. The-gripping and severing device proper consists, as shown in Figures 14 and 15 of the jaws 6| and 62, a spring 63 pressing the yjaw-62 which is iixed to a slidable pin 64 against the stationary jaw 6| which is provided on a guide-sleeve 65 xed to the shaft 60.

' In the advantageous constructional form shown in the drawing only one cutter 66 is provided, which ooacts with the edge `|51 of the jaw. In order that the thread end shall not slip out of the grippers after the thread has lbeen severed, a thread gripping spring 68 is pro-vided, which is xed to the jaw 62 and holds the thread against the other `jaw before the gripping device is closed `and the thread is severed, as illustrated more particularly inv Figure 16.

vFrom Figures 16 and 15 it will be seen, that the gripping and severing device is disposed, during thev cuttingoff of the thread next to the ldolly between the dolly and the thread-guide 6.

In Figure 17 the closed gripping device is shown, holding thethread 1. In this 'figure is also indicated in broken lines the swung-aside position of the gripping jaws 6| and 62, which before the start of theiwinding operation are swung into theposition in broken lines below the dolly and there hold the thread during the winding of the first convolutionsvAszwill .be seen from Figure 14, the pin 64 is heldin the shown opened position of the gripping device by a. locking pin 69 which is loaded by a spring 10. For releasing the locking pin 69 a cam is providedv which is placed in the-path of the pin. The opening of the ,gripping ldevice is suitably Aeffected by a short cam member which lays itself against a roller 1| provided at the end ,of the piny 64.

For controlling the longitudinal motion of the spindles, thread-guides, gripping and holding devices and dipping needles, fixed circular cams 41, 12-and13- are provided as illustrated in Figure 1 (the -ca-m for the ydipping needles iS-not shown).

'-Ihecams"41, 12, 13'an'd 14 are-secured toa hori- 'zontalfdlsc |'00fwhose boss |0| "is secured" to the hollow shaft l|02. Since th'ehollow shaft- |02 is rigidly secured to the-machine'frame the ca-'ms V41,"12,"|3 and14 are stationary.

Through the provision of a 'further 'ring-'shaped dollies of a-length di-iering from vthe normal with the ldevice shown. The cam 14 which controls the spindlesw-ith Van additionalroller is fixed to a circular carrier`16 which is connectedy -ingl the drive is'd'erived from a shaft 82 which is driven for instance by an electric motor and which through toothed wheels 83 and 84 drives' the toothed wheels 85 and 86 and with them the shafts 25, 26.

The spindles 4 Which are mounted in the drum, are driven from a driving shaft 82 and by means of the spur wheels |06, |05, the shaft |04 and the?VA spur wheels |03 and81. The spur wheel 81 is mounted on a rotatably mounted sleeve 88 on which a large spur wheel 89 is mounted. 'I'his spur wheel 89 engages in the individual smallv` spur `wheels 90 arranged on the periphery or cir-iiso cumference of the spur Wheel 89. The spur wheels 90 are axially slidable on the spindles 4 but are each secured against rotation by a groove andkey so that all spindles 4 are simultaneously set in rotation during the rotation of the large?" wheel 89.

For the to and fro motion of the thread guide a crank drive'9l, 92 is suitably provided, which is driven from the spindles through bevel wheels 93, 94. With the crank 92 a. sliding piece 95; which is vslidable on the threadk guide 5 is loosely connected and on the thread guide which is pressed by vmeans of a spring 96-against the cam -12 an adjustable collar 91 is iixed by means of which thesliding piece 95 which is moved to andy fro takes the thread guide 5 along with it only when the cam |2 has released'the thread guide from its lower position offrest.

As'will also'be seen from Figure 1, bobbins 98 are arranged on the cover 2| of the drum 22, the.. number of which corresponds to theinumber of the thread guides and spindles.

With the automatic device shown in Figure 1 avery large output can beproduced, so that about one completely wound carbon dolly per second-I falls out of the device.

The operation of the invention may be reviewed as follows:

The carbon .dollies are inserted by hand in the'bushes 30 of the continuously rotating feedtable 24 (see Fig. 2 and Fig. 5). As soon as such a carbon dolly, during `its circular movement at the point a according to Figure 2 has reached the circle 29 described by the spindles 4during the rotarymovement of the idrum 22, the latter 'will be guided by the cam 28 in Such amanner .that it is moved between the points a and b on the vcircle 29 described by the spindles. If the carbon .dolly moves` further between the points a vand h in the feed-table, it is located a certain period directly below 'the :clamping chuck I1 of the spindle 4. 'During the saidI period, the spindle J4 is forced downward by the cam 41 so that the `clamping chuckfenga'ges'"thejca'rbon rod 2.and during 'the following '1 upward movement :ofv the;`

cam14 (see Fig.- 1) itv isy also possible to wrapi by screws 11 with a sleeve 18. This sleeve is proi spindle 4, the carbon dolly is lifted out, ofthe feed-table under the action ofthe spring 50.

In order thatthe chuck I 1 will properlyv engage the rod 2 of the carbon dolly, a centering device is provided which consists of the disk 34 and the sliding member 38 (Figs. 5 and 6). The disk 34 secured to the stationary cam 28 has such dimensions` that the carbon rod 2, which is resiliently forced against thedisk 34 by the sliding member 38, is located exactly below the spindle 4.

If the carbon dolly engaged by the clamping chuck I1 has reached the point d (Fig. 2), the spindle 4 is again guided by the cam 41 so that the bottom of the carbon dolly according to Figs. '7, 8 or 9 is wetted with paraflin. If this carbon dolly now moves in the arc e (Fig. 2) the thread guide 6,*hitherto held in the position 6 by the cam 12, will vbe released (Fig. 10) so that the collar 91 bears under the action of the spring 96 against the sliding member 95 which is moved to and fro onv the thread guide 5 by the crank drive 9|, S2. The thread, whichis held below the bottom of the carbon dolly, will be wound during the circular movement b by the rapidly reciprocating thread guide 6 in the longitudinal direction over the ends of the carbon dolly. During the further movement of the carbon dolly in the arc f (Fig. 2), the thread guide 6 is held in the lower position 6' by the cam 12 while the spindle 4 rotates continuously. The centering ridge 5| according to Figure 1l is thereby wound whereupon the spindle 4 is moved slowly upward by the cam. 41 under the action of the spring 50 and the thread guide remains in the position 6'. The circularrwinding 56 is thereby wound according to Figure 12. In the uppermost position of the spindle 4 (Fig. 13) the latter remains in its elevated position while rotating continuously. The centering ridge 51 is thereby wound during the circular movement h (Fig. 2). During the following circular movement i of the carbon dolly, the spindle is guided past a wetting or immersing device by the cam 41 (Figs. 7, 8 or 9) so that the carbon dolly is again wetted with insulating material. If the carbon dolly has now reached the point lc, the cam 41 releases the spindle 4 so that the upper rim of the chuck 3 or l1 bears against the abutment 59 (Fig. 10) whereby the clamping chuck is opened and the completely wound carbon dolly falls downward.

I claim:

1. A device for mechanically wrapping carbon dollies for galvanic cells including a rotary spindie, a clamping chuck on the lower end of the spindle for clamping the carbon rod of the dolly, an axially slidably mounted thread guide capable of being reciprocated. beyond the end surfaces of the dolly, an operative driving connection between the spindle and the thread guide, and means adjacent the spindle for gripping the thread at the free end of the dolly during the winding of the initial convolutions and for cutting the thread when the dolly has been wound.

2. A devicev for mechanically wrapping carbon dollies for galvanic cells including a rotary drum, a plurality of winding devices each including a spindle provided with means for engaging a dolly and thread guiding, gripping and cutting-off devices, said winding devices being mounted in a circular manner in the rotary drum and being capable of independent vertical movement through the bottom ofthe drum, a rotary feed table arranged below the drum and having an edge portion lying adjacent an edge portion of the drum, the dollies being arranged in circular relation around the l`edge of the table, a xed cam arranged beneath the drum and in closely spaced relation to the dollies on the table so that the latter. will be guided and `positioned beneath the spindles, means adjacent the top of the drum for effecting lowering of the spindles, and means for rotating the drum and the table synchronously.v

includes concentricallyl arranged annular camsy flxed'adjacent the top of the drum.

5. A device vaccording to claim 2, characterized bythe feature that for using carbon dollies `of another length a second vertically adjustable annular cam is adjustably mounted adjacent the:

top of the drum for cooperating with the spindles carrying the dollies.

6. A device for mechanically wrapping carbon dollies for galvanic cells comprising a plurality of spindles with clamping chucks, longitudinallyv movable thread guides, gripping and cutting-01T devices for the thread, a rotary drum shaped casing, the spindles and thread guides being circularly disposed through the bottom of Ythe casing,

and a plurality of ring-shaped cams arranged iny concentric and xed relation :adjacent the top of the drum-shaped casing for controlling the spindles and thread guides.

-7. A device as claimed in claim 6, comprising an additional ring-shaped control cam for use with carbon dollies of another length, said last mentioned cam being arranged near the top of the drum and capable of being adjusted in the vertical direction for cooperating with the spindles carrying the dollies.

8. A device as claimed in rclaim 6, including means for rotating the spindles independently of each other, a crank gear associated with each spindle, a sliding piece movable on the adjacent thread guide and operable by the crank gear for moving the thread guide to and fro, and an adjusting ring on the thread guide andr yieldingly pressed against the corresponding control cam, the arrangement being such that Athe sliding piece which moves to and fro takes along thei` thread guide only when the control cam has released the thread guide from its position of rest.

9. A device for mechanically wrapping carbon dollies as claimed in claim 6, in which an insulating bath is arranged beneath the drum and includes a rotary applying roller, the dolly on thev spindle during its circular passage engaging said roller, the direction of rotation of the roller being opposite to the movement of the dolly.

10. A device as claimed in claim 6, including;r

the thread guide.

11. Av device for mechanically wrapping carbon dollies for galvanic cells comprising a main support, a main shaft journalled therein, vertical shafts journalled in the support one of which extends considerably above the other, a drum rotat-f' ably mounted on the upper end of the last mentioned shaft, a plurality of spindlesv vertically movable and rotatably mounted through the bottom of said. drum and arranged in circular series, chucks atthelower ends of the spindles fon;

automatically vertically engaging and releasing dollles,'movable thread guides in the drum adjacent each of the spindles and operatively connected thereto, gripping and cutting-off devices arranged adjacent the thread guides, ring shaped cams concentrically arranged in ixed relation adjacent the top of the drum for coacting With the spindles and thread guides to effect vertical movement thereof, a table carried by the upper end of the other Vertical shaftl and having an edge portion disposedbeneath an edge portion of the drum, a plurality of radially disposed and laterally slidable dolly carriers mounted on the table for supporting the dollies in a vertical position and in a circular series about the table so arranged that the dollies will be positioned at times approximately directly beneath the spindles, a stationary cam on the support for cooperating with the dolly carriers to ensure the proper positioning of each of the carriers with the dolly therein beneath the corresponding spindie, and gearing between the main shafts and vertical shafts for effecting synchronous Vrotation of the shafts.`

12. A device as claimed in claim 11, in which a centering disc' is arranged on the support below the drum and concentric with the spindle circle, and a centering fork slidably mounted on y 

